autogen: re-run aclocal after libtoolize

This seems to prevent configure from re-running after the first
invocation of 'make' following ./autogen.sh. The autoreconf script also
does this.

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
Merge pull request #1097 from ceph/fix-configure-rerunning

avoid re-running configure after initial 'make' invocation

This appears to pass the gitbuilders (and the multiple runs of configure have been irritating me for ages). Yay!

Reviewed-by: Sage Weil <sage@inktank.com>